Manually-operated log-sawing machine.



No. 838,438. PATENTED DEC. 1l, 1906. P. MODONALD.

MANUALLY OPERATED LOG SAWING MACHINE. APPLIUATION FILED H1B. 2. 190e.

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UNITED STATES PATENT OFFIOE.

PETER MCDONALD, OF SPOKANE, I/VASHINGTON, ASSIGNOR OF ONE-HALF TO JAMES P. HUGHS, OF SPOKANE, WASHINGTON.

lVIANUALLY-OPERATED LOG-SAWING MACHINE.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Application filed February 2, 1906. Serial No. 299,150.

To all whom t may concern:

L Be it known that I, PETER MCDONALD, a citizen of the United States, residing at Spokane, in the county of Spokane and State of IVashington, have invented new and useful Improvements in lIanually-Operated Log- Sawing Machines, of which the following is s.

specification.

My invention relates to certain improvements in manuallybperated log-sawing machines; and it consists in certain peculiarities in the construction of parts and in certain novel combinations and arrangements of elements substantially as hereinafter described, and particularly pointed out in the subj oined claims.

In the accompanying drawings, illustrating the preferred embodiment of my invention, and in which similar reference characters designate similar parts, Figure 1 is a side elevation of the machine. Fig. 2 is a rear elevation of the machine with the saw removed, and Fig. 3 is a detail view of the adjustable fore leg and its connections.

The frame of the machine is composed of the beam h, supported at the rear end by the legs i i, adapted to rest upon the ground, and at the other end by the fore leg I, adapted to rest upon the log or other thing to be sawed. The legs i i are secured to said beam by the eyebolt connections u v, and they are held in any desired position by suitable stay-rods j j, set-screws K K, and folding arms y y, as is clearly shown in Figs. 1 and 2. Said legs t i are also provided at their lower ends with adjustable extension-pieces l Z, heldin adjusted positions by set-screws m m or similar holding devices. The fore leg I is adjustably secured to the beam 72, by the screw-clamp J and is strengthened by the stay-rod H, extending from near its lower end, as at M, to a suitable screw-clamp G on the beam. This forelegmaybepointed atits lower end, so that it may be driven into the log K or other thing to be sawed to hold the machine steadily in position. Thus it will be understood that the frame of the machine may be folded for easy transportation, that it may be set in a horizontal position for operation even on hilly or uneven ground, and may be adjusted to operate upon any-size log.

Bolted or otherwise secured to the beam h at a suitable position between its ends is the bracket r, in which is fulcrumed, as at s, the actuating-lever The lower extremity of said lever is pivotally attached to the shank B ofthe saw E by the bolt F, and said shank is provided with a telescope-joint C and setscrew D to allow the blade of the saw to be set at any angle in a transverse vertical plane and to give longitudinal extension thereto. The shank B extends somewhat beyond the lever and is provided at its end with a spring A, which is connected with the beam h by link Z and adjustable set-screw u and serves to continually hold the saw firmly in contact with the log K or other thing to be sawed on both the forward and backward strokes. The set-screw u serves to regulate the tension of said spring.

The hand-lever N is preferably bifurcated the greater part of its length, forming the arms g q, which straddle the beam h and the actuating-lever and it is provided with a slotted upper portion fn, in which slide the handle-bars 0, secured in adjusted position by suitable set-screw. Said hand-lever N is fulcrumed in the beam h, as at t, adjacent to and preferably beneath the fulcrum of the actuating-lever w, and each of the arms g is provided near its lower end with a foot-pedal L. As shown in Fig. l, there is a sliding pin-and-slot connection between the hand-lever N and the actuating-lever x, the pin p of the lever N engaging in the slot w of the lever thus communicating the oscillatory motion of the lever N to the lever though in a diiferent arc, owing to the difference in the length of the respective radii.

By the arrangement of levers above described a greater force may be applied to the saw by a moderate application of power with the lengthening of the stroke of the handlever. l

The operators seat a is pivotally attached at b to the u per end of the seat-lever c,which is fulcrumedJ at d in the rear end of the beam h. The lower end of said lever ,c is connected' with the lower end of the hand-lever N by hook e, chain f, and rod g, thus making an adjustable connection therebetween, whereby motion of one lever is communicated to the other.

The operation of the machine may be read- ICO ily understood by reference to the foregoing its length, said bifurcated portion straddling description and the drawings. The machine is set up and properly adjusted in horizontaln position, as shown in Figs. l and 2. If the ground is uneven, one of the legs may take the position indicated in broken lines in Fig. 2. The operator takes his place on the seat ci, places his feet on the pedals L, and him hands grip the handle-bars 0. The full lines in Fig. l show the operating parts as they appear at the end of the backward stroke. By pulling on the handle-bars and pushing on the pedals'the operator moves the saw along its forward stroke, and at the end thereof the "parts jassume the position shown in broken lines in Fig. 1. During this stroke the pressure "on the pedals takes the operators weight from the seat-lever and allows the latter to rise to a nearly vertical position. When the end of the forward stroke is reached, the operator reverses his operation of the handle-bars and ceases to push upon the pedals, thus allowing his weight to rest once more on the' seat, and thereby operate the saw on the backward stroke.

The advantages of the invention above set-forthare in the adjustability of the machine to all unevennesses of the ground, to any-size log or other thing to be sawed, to any position desired by the operator, and for any length of hand-stroke, also' in the angular and longitudinal adjustability of the sawblade and inthe increased power obtained by the peculiar arrangement of operating-levers.

H aving vthus described my invention, what I claim isl. A machine of the class described comprising a frame having a beam and bracket mounted f on top thereof, a saw having a shank provided with adjusting and securing means,-an actuating-lever fulcrumed in said bracket and `raving one end pivotally connected ltosaid shank and its other end provided with a longitudinal slot, a hand-lever fulcrumed insaid beam and provided with a rigid transversely-extending pin adapted to enter and slide in said slot, a seat-lever fulcrumed in said beam rearwardly of said handlever and having one of its ends connected to said hand-lever, and means for holding the saw firmly in contact with the thing to be sawed. 4

2. A machine of the class described comprising a frame having a beam provided with apassage and a bracket mounted above said passage, a saw having a shank provided with adjusting and securing means, an actuatinglever fulcrumed in said bracket and extending through said passage, said actuating-lever having its long downwardly-extending arm pivotally connected to said shank and its short upwardlyextending arm formed with a longitudinal slot, a hand-lever bifursaid beam and actuating-lever and being provided with a transverse pin adapted to enter and slide in said slot, said hand-lever being fulcrumed in said beam below the fulcrum of the actuating-lever and being further provided with longitudinally-adjustable handles and pedals in the upper and lower arms thereof respectively, a seat-lever fulcrumed in the rear end of said beam having its upper end provided with a seat and its lower end connected by an adjustable rod to the lower end of said hand-lever, and a spring adapted to hold said saw firmly in contact with the thing to be sawed.

3. In a machine of the class described, a frame comprising a beam, two legs hinged thereto adjacent to the .rear end thereof and provided with adjustable extensions and means adapted to hold the extensions in adjusted positions, and a third leg vertically adjustably secured to the front end thereof and having a point adapted to be embedded in the thing to be sawed, said legs being provided with adjustably-secured tie-rods, a saw, an actuating-lever having one of its arms pivotally connected to said saw, a handlever adapted to operate said actuating-lever, and a seat-lever connected with said hand-lever, all of said levers being fulcrumed in said. frame. f

4. In a manually operated log sawing machine, the combination with the frame comprising a beam having a passage near its central portion and a bracket mounted adjacent thereto, two legs hingedly secured to said beam adjacent to the rear end. thereof and provided with adjustable extensions and means adapted to hold the extensions in adjusted positions, and a fore leg vertically adj ust-ably secured to the front end thereof and having a point adapted to be embedded in the thing to be sawed, said legs being prosaw and operating means therefor comprising a saw-blade having a shank provided with adjusting and securing means, an actuating-lever fulcrumed in said bracket and extending through said passage, said actupin adapted to enter and slide in said slot,

said hand-lever being fulcrumed in said beam below the fulcrum of said actuating-lever lower arms thereof respectively, a seat-lever cated approximately the lower two-thirds of fulcrumed in the rear end of said beam havvided with adjustably-secured tie-rods, of a lever and being provided with a transverse.

and being provided with longitudinally-adjustable handles and pedals in the upper and IOO TIO

ating-lever having its long downwardly-exing its upper end provided with a seat and its l name to this speeieaton in the presence of lower end connected by an adjustable rod to two subscribing witnesses.

the lower end of said hand-lever and a spring attached to said shank and addpted to hold PETER MCDONALD' 5 said saw-blade firmly in Contact with the thing to be sawed.

Witnesses L. L. WEsTFALL,

In testimony whereof I have signed my l W. G. WEER. 

